The sages who sought to know how the universe was created maintained that the entire universe originated from a single primal principle called SAT. They believed that by whatever name god is worshipped, the worship ultimately reaches SAT or this divine principle. This thought helped to develop the idea of religious tolerance in India.
Going to a Church or a Mosque is not anathema to a hindu as he sees the same god in those places also, but the followers of jealous semitic religions (Jews, Christians and Muslims) cannot tolerate the god/gods of any other religion! That is causing hatred among the citizens of the country.